Scott,
I admit I do see some guys using spoilerons for some 3D stuff. I still think some people's thinking on which way to go is backwards.
Spoilerons on any plane, whether it be a full scale, a glider, or a 3D model are primarily used to spoil or kill lift on the wing. This will make the nose drop. Exactly what you dont want in a harrier.
Flaps on the other hand are used to increase the lift on a wing. When flaps are dropped in any plane the nose will tend to pitch up. Most scale planes that have flaps need nose down trim to compensate for the added lift generated by the flaps.

Good discussion though......